Over at Ebay seller worldwidewebbs is selling this custom made plasma grenade based off the ones that are popular in the Halo series.
"What you have here is a plasma grenade "prop," that you can display next to your Halo 3 Edition Xbox 360, or on your desk, or even attach to a costume. The grenade is made from clear blue plastic and is illuminated from the inside by a blue LED. There is also a genuine red laser built into the grenade. For safety precautions, I have covered the lens with a white paint to prevent the laser from being pointed accidentally into someone's eyes. Still, I would try to avoid looking directly at the laser if at all possible. The grenade comes with a metal base "cup" that can hold the grenade for display. The LED and laser are powered by three button-cell batteries like watch batteries, which are included and can be replaced without disassembling the grenade, and which are activated by a slide switch."
The grenade sells for $19.99 with a shipping cost of $5. For a object that doesn't even do anything I would be more than willing to shell out the 20 bucks for this amazing piece of work.
~The new guy. (Hotapplepie)